More importantly, our construction is not restricted to the Federbush models.
One can take any wedge-split net with inner symmetry. This contains, for example,
the tensor product of one of Lechner's models [1]}, instead of the real free field.
One can consider \(n\)  copies of the real free field, which have \(\mathrm {O}(n)\)  symmetry, then
take any subgroup of \(\mathrm {O}(n)\)  isomorphic to \(S^1\)  or \({\mathbb {Z}}_N\) . This should correspond to the
Lie-algebraic generalization of the Federbush models, whose form factors were proposed in [2]}.
It works also with \(n\)  copies of one of Lechner's models.
Furthermore, the constructed net admits again inner symmetry
and is wedge-split, hence one can repeat the construction to obtain further new models
(on a bigger Hilbert space).
